KR102666096B1 - Continous manufacturing process for silica-aerogel adiabatic sheet having a continuous patterned insulation coating layer - Google Patents

Abstract

The present invention provides silica for manufacturing electric vehicle batteries, in which an insulating coating layer 45 containing airgel powder and silica particles is formed in a continuous pattern on the surface of a support, enabling the continuous production of silica-airgel insulating sheets with excellent tensile strength and insulating properties. -Relates to a continuous manufacturing method of airgel insulating sheets.

Description

Continuous manufacturing process for silica-aerogel adiabatic sheet having a continuous patterned insulation coating layer }

The present invention relates to a continuous manufacturing method of a silica-airgel insulating sheet that can be continuously produced by forming an insulating coating layer in a continuous pattern on the surface of the support with airgel, thereby providing excellent tensile strength and insulating properties.

The core competitiveness of electric vehicles is long-term driving range and safety in the event of an accident, and the capacity and safety of the secondary battery determine this. The secondary battery is manufactured with an array of unit cells, but when the unit cell is destroyed, the temperature instantly rises to over 700 to 1,000°C, causing a chain explosion, which can lead to serious safety problems.

In order to solve the above safety problems, there are attempts to prevent thermal runaway by adding structural insulation materials. However, inorganic insulation sheets such as glass fiber, rock wool, or mica sheets are excellent in durability, but have the disadvantage of relatively high thermal conductivity. There is still a risk of serial explosions due to external shocks.

Looking at the prior art related to insulation sheets using airgel, Republic of Korea Patent Publication No. 10-1516479 discloses a manufacturing method of airgel insulation sheets manufactured by mixing airgel powder and a volatile organic solvent, and Republic of Korea Patent Publication No. 10 -No. 1241054 discloses a method of manufacturing a composite sheet for insulation by dispersing airgel at a certain concentration in a mixed solvent to create an airgel dispersion solution, impregnating the non-woven fabric, drying it, and then laminating it with a porous moisture-permeable waterproof sheet such as a highly heat-resistant PTFE membrane. It is done.

The airgel is a representative ultraporous nanostructured material with a three-dimensional network structure basically made of silicon oxide (SiO ₂ ). The wet gel produced through a sol-gel reaction is a superporous material that does not exist at the gas-liquid interface. It is a material that dries without shrinkage under critical conditions and maintains the pore structure of the gel. Therefore, it is an ultra-light material with a porosity of 95 to 99% and a density of 0.003 g/cm3, which is only about 3 times the density of air, making it a material with excellent insulation properties.

Therefore, the insulation sheet using the airgel has excellent insulation properties and can be manufactured thinly compared to the inorganic insulation sheet, but has a problem of being easily separated due to friction occurring between cells due to poor durability. In addition, insulation sheets using airgel have major disadvantages in that the insulation layer is cut by external force due to lack of durability, and continuous production is difficult due to insufficient tensile strength.

The present invention is intended to solve the problems of the prior art as described above. Airgel is coated on the surface of a support to form an insulating coating layer, and a silica-airgel mixed powder slurry is impregnated into the support to form an insulating impregnation layer. The technical task is to provide a continuous manufacturing method of a silica-airgel insulating sheet that can be continuously produced by forming the insulating impregnation layer in a continuous pattern shape.

The method for manufacturing a silica-airgel insulating sheet in which the insulating coating layer is formed in a continuous pattern according to the present invention to solve the above problem includes: i) preparing a first solution (25) by mixing distilled water, a binder, a thickener, and airgel powder; The first step (S100); ii) a second step of preparing the support 10 (S200); iii) a third step (S300) of coating the first solution (25) prepared in the first step (S100) in a continuous pattern on the top of the support 10 prepared in the second step (S200); iv) a fourth step (S400) of drying the first solution 25 coated in the third step to form a first coating layer 20 in a continuous pattern on the upper part of the support 10; v) a fifth step of preparing a second solution by mixing airgel powder with alcohol (S500); vi) An agent for producing a slurry containing silica particles and airgel powder formed by a sol-gel reaction by mixing and maturing the silica precursor in the second solution prepared in the fifth step (S500) to form silica particles. Step 6 (S600); vii) a seventh step (S700) of pulverizing the slurry prepared in the sixth step (S600) to produce slurry powder with a uniform particle size; ⅷ) An eighth step (S800) of preparing the first composition (35) by mixing the slurry powder prepared in the seventh step (S700) with short fibers and aminopropyltriethoxysilane; ix) a ninth step (S900) of forming a second coating layer 30 by spraying the first composition between the continuous patterns prepared in the fourth step (S400); x) a 10th step (S1000) of compressing the second coating layer 30 formed in the 9th step (S900) and impregnating it into the inside of the support 10; and ⅹi) an 11th step (S1100) of drying the second coating layer 30 formed in the 10th step (S900); wherein the thickener included in the dispersion composition in the first step (S100) is At least one selected from the group consisting of carboxymethylcellulose, polyacrylic acid, gelatin, superabsorbent polymer, and cellulose, and the binder is selected from the group consisting of sodium silicate, potassium silicate, lithium silicate, epoxy, acrylic, polyvinyl alcohol, and silicone binder. In the first step (S100), 30 to 60% by weight of an organic-inorganic mixed binder, 20 to 50% by weight of airgel powder, and the remaining dispersion composition are mixed at 20 to 30% by weight, and the second step (S200) ), the support 10 is at least one selected from the group consisting of E-Glass Tissue, hemp fiber, polypropylene fiber, polyethylene fiber, polyester fiber, nylon fiber, silica fiber, basalt fiber, and carbon fiber, and the second In step S200, the thickness of the support 10 is 100 to 1,000 ㎛, and in the third step (S300), the continuous pattern shape may be a circle, honeycomb, or polygon, and in the third step (S300), the continuous pattern shape is The shape is preferably a perforated shape formed by a punching process.

In addition, in the fifth step (S500), the alcohol is at least one selected from the group consisting of butanol, isopropyl alcohol, ethanol, methanol, propanol, and pentanol, and the first step (S100) and the fifth step (S500) The average particle diameter of the airgel powder used is 30 to 50 ㎛, and in the fifth step (S500), the airgel powder is contained at 10 to 20% by weight, and in the sixth step (S600), the silica precursor is tetraethylorthosilicate. (tetraethyl orthosilicate, TEOS), tetramethyl orthosilicate (TMOS), alkylalkoxysilane, bistrialkoxy alkyl, aryl silane, polyhedral silsesquioxane ) may be one or more selected from the group consisting of, and in the sixth step (S600), the silica precursor is included in an amount of 2 to 10% by weight relative to the second solution, and the average particle diameter of the silica particles in the sixth step (S600) is 10 nm to 30 ㎛, and the first composition prepared in the eighth step (S800) is 70 to 90% by weight of silica-airgel mixed powder slurry, 5 to 20% by weight of short fibers, and the balance is aminopropyltriethoxysilane. It consists of 5 to 10% by weight, and the short fibers are at least one selected from the group consisting of glass fibers, ceramic fibers, silica fibers, carbon fibers, and silica fibers, and the length of the short fibers used in the eighth step (S800) is 10 to 50 mm, and the average diameter is preferably 5 to 30 ㎛.

In particular, the tensile strength of the silica-airgel insulating sheet 100 according to the present invention is 2 to 11 N/mm ² , the dielectric breakdown strength is 4 to 9 KV/mm, and the dielectric breakdown voltage is 4 to 9 KV. desirable.

According to the continuous manufacturing method of the silica-airgel insulating sheet in which the insulating coating layer 45 is formed in a continuous pattern shape according to the present invention, the tensile strength of the silica-airgel insulating sheet 100 increases and the insulating coating layer 45 is formed during the process. It has the effect of enabling continuous production without cutting. In addition, the silica-airgel insulating sheet 100 manufactured according to the present invention has more efficient insulating properties than the insulating sheet manufactured by the existing method by forming the insulating coating layer 45 with airgel powder and silica particles. In addition, since the silica-airgel insulating sheet 100 with excellent tensile strength and insulating properties can be manufactured through a continuous process, economic feasibility and process efficiency can be secured.

Figure 1 is a manufacturing flow chart of a silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape,
Figure 2 is a cross-sectional view of the silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape,
Figure 3 is a manufacturing process diagram of the silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape,
Figure 4 is a product photo (a) and a curved photo (b) of a silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape.

In this application, terms such as “comprise,” “have,” or “equipped” are intended to designate the presence of features, numbers, steps, components, parts, or combinations thereof described in the specification, and are not intended to indicate the presence of one or more other features, numbers, steps, components, parts, or combinations thereof. It should be understood that this does not exclude in advance the possibility of the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Additionally, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Below, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings. In order to facilitate overall understanding when describing the present invention, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

Hereinafter, the continuous manufacturing method of the silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern will be described in detail with reference to the accompanying drawings. Figure 1 attached to the present invention is a manufacturing flow chart of the silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape, and Figure 2 shows the insulating coating layer 45 according to the present invention. It is a cross-sectional view of the silica-airgel insulating sheet 100 formed in a continuous pattern shape, and Figure 3 is a manufacturing process diagram of the silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape, Figure 4 is a product photo (a) and a curved photo (b) of a silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape.

As shown in FIG. 1, the continuous manufacturing method of the silica-airgel insulating sheet 100 in which the insulating coating layer 45 is formed in a continuous pattern according to the present invention includes i) mixing distilled water, a binder, a thickener, and airgel powder. A first step (S100) of preparing the first solution (25); ii) a second step of preparing the support 10 (S200); iii) a third step (S300) of coating the first solution (25) prepared in the first step (S100) in a continuous pattern on the top of the support 10 prepared in the second step (S200); iv) a fourth step (S400) of drying the first solution 25 coated in the third step to form a first coating layer 20 in a continuous pattern on the upper part of the support 10; v) a fifth step of preparing a second solution by mixing airgel powder with alcohol (S500); vi) An agent for producing a slurry containing silica particles and airgel powder formed by a sol-gel reaction by mixing and maturing a silica precursor in the second solution prepared in the fifth step (S500) to form silica particles. Step 6 (S600);

vii) a seventh step (S700) of pulverizing the slurry prepared in the sixth step (S600) to produce slurry powder with a uniform particle size; ⅷ) An eighth step (S800) of preparing the first composition (35) by mixing the slurry powder prepared in the seventh step (S700) with short fibers and aminopropyltriethoxysilane; ix) a ninth step (S900) of forming a second coating layer 30 by spraying the first composition between the continuous patterns prepared in the fourth step (S400); x) a 10th step (S1000) of compressing the second coating layer 30 formed in the 9th step (S900) and impregnating it into the inside of the support 10; and ⅹi) an 11th step (S1100) of drying the second coating layer 30 formed in the 10th step (S900).

Looking at this in detail, it is as follows.

1st Step (S100)

The silica-airgel insulating sheet 100 manufactured by the continuous manufacturing method of the silica-airgel insulating sheet 100 in which the insulating coating layer 45 according to the present invention is formed in a continuous pattern shape can be used for manufacturing electric vehicle batteries.

Specifically, the silica-airgel insulation sheet (100) according to the present invention can be applied to all places where insulation is required, such as unmanned drones, ESS battery cell packs, electronic components, refrigerators, building materials, automobiles, aircraft, industrial pipelines, thermoses, etc. In particular, it is used as a material to prevent heat diffusion between battery cells of electric vehicles, and can be applied to prevent fires caused by external physical shock or heat. In particular, it can be applied to prevent the entire battery pack from developing into a thermal runaway state that can cause fire or explosion due to overheating or hot spots in the battery cells of electric vehicles.

As shown in FIG. 1, the silica-airgel insulating sheet 100 according to the present invention as described above is prepared in a first step (S100) of preparing a first solution 25 by first mixing a binder, a thickener, airgel powder, and distilled water. It goes through.

When preparing the first solution 25 in the first step (S100), the first solution 25 contains 15 to 40% by weight of a binder, 1 to 3% by weight of a thickener, 10 to 30% by weight of airgel powder, and the balance of distilled water. It can be manufactured by mixing.

The airgel powder that can be used in the present invention is a highly porous material with a high porosity of up to 99%, and the average particle diameter is preferably 30 to 50 um in terms of ease of mixing in the subsequent process and sheet manufacturing. The airgel powder is preferably mixed in an amount of 10 to 30% by weight when preparing the first solution 25.

In addition, the thickener is used to make the viscosity of the first solution 25 suitable for coating, and the thickener is preferably at least one selected from the group consisting of carboxymethylcellulose, polyacrylic acid, gelatin, superabsorbent polymer, and cellulose. , the thickener is preferably mixed in an amount of 1 to 3% by weight. If the thickener is mixed in an amount of less than 1% by weight, a problem occurs in which the airgel powder is not well dispersed, and if the thickener is mixed in an amount exceeding 3% by weight, the viscosity of the first solution 25 increases, making coating impossible.

Additionally, the binder is added to bind the airgel powder to the support. It is possible to use an organic or inorganic binder as the binder. The inorganic binders include sodium silicate, potassium silicate, and lithium silicate, and the organic binders include epoxy, acrylic, polyvinyl alcohol, and silicone.

According to the present invention, the binder is preferably used by mixing an organic binder and an inorganic binder. In this case, the organic binder may be included at 1 to 10% by weight, and the inorganic binder is preferably mixed at 90 to 99% by weight. do.

In addition, it may be desirable to use the inorganic binder by mixing sodium silicate, potassium silicate, and lithium silicate together, and in this case, it is most preferable to mix the sodium silicate, potassium silicate, and lithium silicate in a weight ratio of 1:7:2. You can. If the mixture is not mixed at the above ratio, the problem of poor adhesion occurs.

According to the present invention, the first solution 25 prepared in the first step (S100) is preferably prepared including airgel powder, silica airgel powder, silica mineral powder, silica hydrogel, silica bubble, and fumed silica. It is also possible to manufacture it by replacing it with at least one insulating material selected from the group consisting of powder.

2nd Step (S200)

The second step (S200) according to the present invention is a step of preparing a support 10 for manufacturing the silica-airgel insulating sheet 100, and the support 10 is prepared in the first step (S100). The silica-airgel insulating sheet 100 is manufactured by coating the solution 25 and the first composition 35, which will be described later, on the top.

According to the present invention, the support 10 may be made of non-woven fabric. The support 10 is manufactured using one or more fiber materials selected from the group consisting of E-Glass Tissue, hemp fiber, polypropylene fiber, polyethylene fiber, polyester fiber, nylon fiber, silica fiber, basalt fiber, and carbon fiber. It can be a non-woven fabric.

In particular, it is preferable that the support 10 has a density such that airgel powder cannot pass through. That is, it is preferable that the density of the nonwoven fabric is 0.05 to 0.3 g/cm ³ .

If the density of the nonwoven fabric used as the support 10 is less than 0.05 g/cm ³ , the density is low and silica particles and airgel powder pass through during the manufacturing process, resulting in poor insulation properties and reduced strength. In addition, when the density of the nonwoven fabric exceeds 0.3 g/cm ³ , the density is high and silica particles and airgel powder do not pass through, but the manufacturing process is poor.

In addition, it is particularly preferable that the thickness of the nonwoven fabric for application as the support 10 as described above is 10 to 1,000 ㎛.

Therefore, the mechanical properties of the silica-airgel insulating sheet 100 manufactured within the range of thickness and density of the nonwoven fabric described above have excellent mechanical properties, and the formation of the insulating coating layer 45 is facilitated.

3rd Step (S300)

The third step (S300) according to the present invention involves coating the first solution (25) prepared in the first step (S100) in a continuous pattern on the top of the support 10 prepared in the second step (S200). Point out the steps.

In forming a continuous pattern according to the present invention, as shown in FIG. 3, the support 10 is guided by a pair of guide rolls 50 and enters the inside of the coater 60. The coater 60 coats the first solution 25 on the top of the support 10.

According to the present invention, the coater 60 may be a spray coater, a roll coater, or a bar coater, but is not limited thereto.

The coater 60 evenly coats the first solution 25 onto the support 10 to form a coating layer of the first solution 25 on the support 10. By forming a coating layer on the upper part of the support 10 using the first solution 25 as described above, the first coating layer 20 containing airgel powder is subsequently formed as shown in FIG. 2.

After the coating layer of the first solution 25 is formed on the top of the support 10 as described above, the support 10 is transferred to the continuous pattern forming roll 70. The continuous pattern forming roll 70 is a roller with an embossed or engraved pattern formed on its surface, and forms a continuous pattern by pressing the coating layer of the first solution 25.

The continuous pattern refers to a certain shape or model, and according to the present invention, the continuous pattern shape is preferably circular, honeycomb shaped, or polygonal. Additionally, according to the present invention, the continuous pattern may be a perforated shape formed through a punching process.

In particular, according to the present invention, a silica-airgel insulating sheet is manufactured by forming a continuous pattern by pressing the coating layer of the first solution (25) sprayed on the surface of the support (10) by the continuous pattern forming roll (70). This has the effect of increasing the tensile strength of (100).

According to the present invention, the area of the continuous pattern shape formed in the third step (S300) is preferably 30 to 70% of the area of the entire support 10, and when the continuous pattern is formed in the above range, The tensile strength of the manufactured silica-airgel insulating sheet 100 may be the best.

4th Step (S400)

The fourth step (S400) according to the present invention is to dry the continuous pattern made of the first solution (25) formed in the third step (S300) using the first dryer (80) to form a support as shown in FIG. This refers to the step of forming a first coating layer 20 in the shape of a continuous pattern on the upper part of (10).

When performing the fourth step (S400), the drying temperature is preferably 50 to 120°C. If the drying temperature is less than 50°C, the drying time may take too long, and if it exceeds 150°C, browning or cracking of the first coating layer 20 may occur due to a rapid change in temperature.

In addition, the drying time is preferably 1 to 5 hours. If the drying time is less than 1 hour, complete drying may not be achieved, and if the drying time is longer than 5 hours, the first coating layer 20 may be damaged due to a sudden temperature change. Cracks may occur.

The first dryer 80 used in the fourth step (S400) is not particularly limited, but a hot air dryer or an oven dryer is preferable.

Lesson 5 Step (S500)

The fifth step (S500) according to the present invention refers to the step of preparing a second solution by mixing airgel powder with alcohol.

The alcohol used in the fifth step (S500) is preferably at least one from the group consisting of butanol, isopropyl alcohol, ethanol, methanol, propanol, and pentanol.

In addition, the same airgel powder as in the first step (S100) may be used, and when preparing the second solution through the fifth step (S500), the airgel powder may be included in an amount of 10 to 20% by weight, and the alcohol may be contained in an amount of 80 to 90% by weight. Can be mixed in weight percent.

Lesson 6 Step (S600)

In the sixth step (S600), a silica precursor is mixed and aged in the second solution prepared in the fifth step (S500) to form silica particles through a sol-gel reaction. As silica particles are formed through a sol-gel reaction as described above, the second solution can be prepared in the form of a slurry containing both silica particles and airgel powder.

According to the present invention, the silica precursor is tetraethyl orthosilicate (TEOS), tetramethyl orthosilicate (TMOS), alkylalkoxysilane, bistrialkoxy alkyl, aryl silane ( aryl silane), polyhedral silsesquioxane, and mixtures thereof.

At this time, the silica precursor is included in an amount of 2 to 10% by weight relative to the second solution, and is then aged to form silica particles through a sol-gel reaction.

At this time, the maturation temperature is preferably 40 to 60° C., and the maturation time is preferably 24 to 48 hours.

As described above, silica particles are produced through a sol-gel reaction, and the average particle diameter of the silica particles produced at this time is preferably 10 nm to 30 ㎛. By producing silica particles as described above, a slurry containing both silica particles and airgel powder is produced.

Lesson 7 Step (S700)

The slurry prepared through the sixth step*S600) is pulverized in the seventh step (S700) to produce a silica-airgel mixed powder slurry having a uniform particle size.

The slurry prepared in the sixth step (S600) contains airgel powder and silica particles having a porous structure through a sol-gel reaction, and can be disintegrated using an attrition mill or bead mill. It is possible to produce slurry powder by pulverizing it using equipment.

In the seventh step (S700), the slurry is preferably pulverized into particles having an average particle size of 150 nanometers to 800 nanometers.

Lesson 8 Step (S800)

In the eighth step (S800) according to the present invention, the first composition (35) is prepared by mixing the slurry powder prepared in the seventh step (S700) with short fibers and aminopropyltriethoxysilane.

When preparing the first composition (35), it is preferable that it consists of 70 to 90% by weight of silica-airgel mixed powder slurry, 5 to 20% by weight of short fibers, and the balance of 5 to 10% by weight of aminopropyltriethoxysilane. .

At this time, the single fiber may be at least one selected from glass fiber, silica fiber, ceramic fiber, carbon fiber, etc. In addition, it is particularly preferable that the length of the single fiber is 10 to 50 mm and the average diameter is 5 to 30 ㎛.

In addition, the aminopropyltriethoxysilane serves as a binder in the first composition 35, thereby agglomerating the slurry powder and short fibers and attaching them to the top of the first coating layer 20. do.

Lesson 9 Step (S900)

The first composition 35 prepared in the eighth step (S800) is a continuous pattern-shaped first coating layer (S900) formed on the top of the support 10 prepared in the fourth step (S400). 20) to form the second coating layer 30. The ninth step (S900) can be performed using an application device 90, such as a conventional spray, as shown in FIG. 3.

As described above, the first composition 35 sprayed between the first coating layers 20 later forms the second coating layer 30. By forming the second coating layer 30 containing silica particles and airgel powder as described above, it is possible to manufacture the silica-airgel insulating sheet 100 with maximized thermal insulation properties.

Lesson 10 Step (S1000)

In the tenth step (S1000) according to the present invention, as shown in FIG. 3, the second coating layer 30 formed in the ninth step (S900) is pressed with a pressing roll 75, thereby applying the first composition to the support. It is impregnated inside.

By forming the second coating layer 30 with the first composition impregnated into the inside of the support as described above, the effect of improving the tensile strength, etc. of the silica-airgel insulating sheet 100 according to the present invention can be obtained. .

Lesson 11 Step (S1100)

In the 11th step (S1100) according to the present invention, the second coating layer 30 formed in the 10th step (S900) is dried using the second dryer 85, thereby forming the silica-airgel insulating sheet 100 according to the present invention. manufacturing can be completed. The eleventh step (S1100) may be performed at a temperature of 120 to 140 °C for 30 minutes to 1 hour.

The second dryer 85 used in the 11th step (S1100) is not particularly limited, but may be a hot air dryer or an oven dryer.

By drying the second coating layer 30 through the 11th step (S1100) as described above, the manufacture of the silica-airgel insulating sheet 100 according to the present invention can be completed as shown in (a) of FIG. 4. As shown in FIG. 2, the insulating coating layer 45 according to the present invention may be formed in a continuous pattern shape of the first coating layer 20 and the second coating layer 30, where the thickness of the insulating coating layer 45 is is preferably 10 to 300 ㎛.

Hereinafter, the present invention will be examined in more detail through examples. However, the present invention is not limited to the following examples.

[ Example One]

A first solution (25) is prepared and used by mixing 12 g of carboxymethyl cellulose as a thickener, 200 g of binder, and 160 g of airgel powder (average particle diameter 50 ㎛) with 300 g of distilled water, where the binder is 10 weight of epoxy, an organic binder. It was prepared by mixing 90% by weight of an inorganic binder containing sodium silicate, potassium silicate, and lithium silicate in a weight ratio of 1:7:2. The first solution 25 prepared as above was applied to the support 10, a nonwoven fabric made of E-glass fiber (density: 0.05 g/cm ³ , thickness 15 ㎛), and a honeycomb with an area of 30% compared to the support 10. Coating was performed while forming a continuous pattern of the shape and hot air dried at 50° C. for 5 hours in the first dryer 80.

In addition, a second solution was prepared by mixing 140 g of airgel powder (average particle diameter 50 ㎛) with 880 g of butanol, and 24 g of tetraethyl orthosilicate, a silica precursor, was mixed with the second solution at 50 ° C. Silica particles were prepared by aging for 24 hours to prepare a slurry containing silica particles and airgel powder.

Afterwards, the slurry was pulverized to prepare a slurry powder with an average particle size of 150 nanometers, and 4 g of the slurry powder, 6 g of E-glass fiber single fiber (length 10 mm, average diameter 5 ㎛), and aminopropyl triethylene were added. The first composition (35) was prepared by mixing 10 g of toxysilane.

Thereafter, the first composition 35 is applied to the first coating layer 20 formed in a honeycomb-shaped continuous pattern and pressed to form the first coating layer 20 and the second coating layer 30 in succession, and then dried in a second dryer. In (85), a test piece of the silica-airgel insulation sheet (100) was prepared by hot air drying at 120°C for 1 hour.

[ Example 2]

A first solution (25) was prepared and used by mixing 10 g of carboxymethyl cellulose as a thickener, 250 g of binder, and 150 g of airgel powder (average particle diameter 50 ㎛) with 300 g of distilled water, where the binder was the same as in Example 1. was used. The first solution 25 prepared as above was applied to the polypropylene nonwoven fabric (density: 0.1 g/cm ³ , thickness 100 ㎛) as the support 10 to form a circular continuous pattern with an area of 45% compared to the support 10. Coating was performed while forming and dried with hot air at 100°C for 2 hours in the first dryer 80.

In addition, a second solution was prepared by mixing 200 g of airgel powder (average particle diameter 50 ㎛) with 880 g of isopropyl alcohol, and 100 g of tetramethyl orthosilicate, a silica precursor, was mixed with the second solution and then dissolved for 50 g. Silica particles were prepared by aging at ℃ for 24 hours to prepare a slurry containing silica particles and airgel powder.

Afterwards, the slurry was pulverized to prepare a slurry powder having an average particle size of 150 nanometers, and 5 g of the slurry powder, 10 g of single fibers of ceramic fibers (length 30 mm, average diameter 10 ㎛), and aminopropyl triethoxy The first composition (35) was prepared by mixing 15 g of silane.

Thereafter, the first composition 35 is applied to the first coating layer 20 formed in a honeycomb-shaped continuous pattern and pressed to form the first coating layer 20 and the second coating layer 30 in succession, and then dried in a second dryer. In (85), a test piece of the silica-airgel insulation sheet (100) was prepared by hot air drying at 140°C for 30 minutes.

[ Example 3]

A first solution (25) was prepared and used by mixing 25 g of polyacrylic acid as a thickener, 200 g of binder, and 300 g of airgel powder (average particle diameter 50 ㎛) with 500 g of distilled water, where the binder was the same as in Example 1. used. The first solution 25 prepared as above was applied to the polyester nonwoven fabric (density: 0.3 g/cm ³ , thickness 150 ㎛) as the support 10 to form a continuous rectangular pattern with an area of 70% compared to the support 10. Coating was performed while forming and dried with hot air at 50°C for 5 hours in the first dryer 80.

In addition, a second solution was prepared by mixing 210 g of airgel powder (average particle diameter 50 ㎛) with 850 g of butanol, and 100 g of tetraethyl orthosilicate, a silica precursor, was mixed with the second solution at 50 ° C. Silica particles were prepared by aging for 24 hours to prepare a slurry containing silica particles and airgel powder.

Afterwards, the slurry was pulverized to prepare a slurry powder having an average particle size of 150 nanometers, and 8 g of the slurry powder, 12 g of carbon fiber single fibers (length 50 mm, average diameter 30 ㎛), and aminopropyl triethoxy The first composition (35) was prepared by mixing 20 g of silane.

Thereafter, the first composition 35 is applied to the first coating layer 20 formed in a honeycomb-shaped continuous pattern and pressed to form the first coating layer 20 and the second coating layer 30 in succession, and then dried in a second dryer. In (85), a test piece of the silica-airgel insulation sheet (100) was prepared by hot air drying at 140°C for 30 minutes.

And the above test pieces were evaluated for tensile strength, dielectric breakdown strength, and dielectric breakdown voltage using the following methods.

1) Tensile strength

With respect to the silica-airgel insulating sheet 100 manufactured according to Example 1-3, the MD (mechanical direction) direction was measured according to KSK 0520 (Testing Method for Tensile Strength and Elongation of Fabrics) using a tensile strength tester (Instron). The tensile strength was measured, and the results are shown in Table 1.

2) Dielectric breakdown strength and breakdown voltage

Regarding the silica-airgel insulating sheet 100 manufactured according to Example 1-3, the dielectric breakdown strength and The breakdown voltage was measured, and the results are shown in Table 1.

Tensile strength (N/mm ² ) Dielectric breakdown strength (KV/mm) Dielectric breakdown voltage (KV) Example 1 2.1 3.9 4.0 Example 2 4.7 6.3 5.6 Example 3 11.2 9.1 9.2

Looking at Table 1, in the case of the test specimens according to Examples 1 to 3, the tensile strength in the MD direction is 2.1 to 11.2 N/mm ²

It was measured to have a range of . In the case of an insulation sheet using airgel according to the prior art, the tensile strength in the MD direction has a measured value of 1.0 N/mm ² or less, and as described above, the tensile strength is so small that it cannot be produced in a continuous process.

In the case of the test specimens of Examples 1 to 3 according to the present invention, 2.1 N/mm ² due to the insulating coating layer 45 formed in a continuous pattern shape. Since the above tensile strength measurements are shown, it can be seen that production is possible through a continuous process because no cutting occurs during the manufacturing process.

In addition, it can be seen that the airgel powder and silica particles form an insulating coating layer 45 on the surface of the insulating sheet, so that the dielectric breakdown strength has a measured value of 3.9 KV/mm or more, and the dielectric breakdown voltage also has a measured value of 4.0 KV or more. .

In the case of an insulation sheet using airgel according to the prior art, the insulation breakdown strength has a measured value of 2.0 KV/mm or less, and the insulation breakdown voltage has a measured value of 1.5 KV or less.

Therefore, it can be seen that the test specimens of Examples 1 to 3 according to the present invention have significantly excellent insulating properties due to the insulating coating layer 45 containing airgel powder and silica particles formed on the surface.

Through the first step (S100) to the tenth step (S1000) described above, a silica-airgel insulating sheet (100) in which the insulating coating layer (45) according to the present invention is formed in a continuous pattern shape can be manufactured, The silica-airgel insulation sheet 100 can be used for manufacturing electric vehicle batteries.

The silica-airgel insulating sheet 100 of the present invention manufactured as described above has an increased tensile strength as a continuous pattern is formed on the surface, so that the insulating coating layer 45 is maintained even when bent, as shown in (b) of Figure 4. It can be confirmed that it can be manufactured in a continuous process without cutting, and that it has quite excellent insulating properties due to the insulating coating layer 45 containing airgel powder and silica particles formed on the surface. Accordingly, the silica-airgel insulation sheet 100, which has low thermal conductivity and excellent tensile strength, can be manufactured through a continuous process, thereby ensuring economic feasibility and process efficiency.

The present invention has been described with reference to the experimental examples shown in the drawings, but these are merely exemplary, and those skilled in the art will understand that various modifications and other equivalent experimental examples are possible therefrom. Additionally, a person skilled in the art to which the present invention pertains will understand that the present invention can be easily modified into another specific form without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive, and the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

100: Silica-airgel insulation sheet
10: support
20: first coating layer
25: first solution
30: second coating layer
35: first composition
50: Guide roll
60: coater
70: Continuous pattern forming roll
80: first dryer
85: second dryer
90: Applicator

Claims (9)

A continuous manufacturing method of a silica-airgel insulating sheet (100) in which the insulating coating layer (45) is formed in a continuous pattern shape,
i) a first step (S100) of preparing a first solution (25) by mixing distilled water, a binder, a thickener, and airgel powder;
ii) a second step of preparing the support 10 (S200);
iii) a third step (S300) of coating the first solution (25) prepared in the first step (S100) in a continuous pattern on the upper part of the support 10 prepared in the second step (S200);
iv) a fourth step (S400) of drying the first solution (25) coated in the third step to form a first coating layer (20) in a continuous pattern shape on the upper part of the support (10);
v) a fifth step of preparing a second solution by mixing airgel powder with alcohol (S500);
vi) An agent for producing a slurry containing silica particles and airgel powder formed by a sol-gel reaction by mixing and maturing a silica precursor in the second solution prepared in the fifth step (S500) to form silica particles. Step 6 (S600);
vii) a seventh step (S700) of pulverizing the slurry prepared in the sixth step (S600) to produce slurry powder with a uniform particle size;
ⅷ) An eighth step (S800) of preparing the first composition (35) by mixing the slurry powder prepared in the seventh step (S700) with short fibers and aminopropyltriethoxysilane;
ix) a ninth step (S900) of forming a second coating layer 30 by spraying the first composition between the continuous patterns prepared in the fourth step (S400);
x) a 10th step (S1000) of compressing the second coating layer 30 formed in the 9th step (S900) and impregnating it into the inside of the support 10; and
ⅹi) an 11th step (S1100) of drying the second coating layer 30 formed in the 10th step (S900); a silica-airgel insulating sheet (100) in which the insulating coating layer (45) is formed in a continuous pattern shape, including Continuous manufacturing method of
In claim 1,
In the first step (S100), the thickener is silica-insulating coating layer 45 formed in a continuous pattern shape, characterized in that at least one selected from the group consisting of carboxymethyl cellulose, polyacrylic acid, gelatin, superabsorbent polymer, and cellulose. Continuous manufacturing method of airgel insulation sheet (100)
delete In claim 1,
In the second step (S200), the support 10 is one selected from the group consisting of E-Glass Tissue, hemp fiber, polypropylene fiber, polyethylene fiber, polyester fiber, nylon fiber, silica fiber, basalt fiber, and carbon fiber. A continuous manufacturing method of a silica-airgel insulating sheet (100) in which the insulating coating layer (45) is formed in a continuous pattern shape, characterized by the above.
In claim 1,
In the third step (S300), the continuous pattern shape is a circle, honeycomb, or polygon. A continuous manufacturing method of the silica-airgel insulation sheet 100 in which the insulating coating layer 45 is formed in a continuous pattern shape.
In claim 1,
In the third step (S300), the continuous pattern shape is a perforated shape formed by a punching process. A continuous manufacturing method of the silica-airgel insulation sheet 100 in which the insulating coating layer 45 is formed in a continuous pattern shape.
In claim 1,
In the fifth step (S500), the alcohol is at least one selected from the group consisting of butanol, isopropyl alcohol, ethanol, and methanol. A silica-airgel insulation sheet (100) in which the insulating coating layer 45 is formed in a continuous pattern shape. ) continuous manufacturing method
In claim 1,
In the sixth step (S600), the silica precursor is tetraethyl orthosilicate (TEOS), tetramethyl orthosilicate (TMOS), alkylalkoxysilane, bistrialkoxy alkyl, and aryl. A silica-airgel insulation sheet (100) in which an insulating coating layer (45) is formed in a continuous pattern shape, characterized in that it is one or more selected from the group consisting of aryl silane and polyhedral silsesquioxane. Continuous manufacturing method
The insulating coating layer (45) manufactured by the continuous manufacturing method of the silica airgel insulating sheet (100) for manufacturing electric vehicle batteries in which the insulating coating layer (45) of any one of claims 1, 2, and 4-8 is formed in a continuous pattern shape is continuous. Silica-airgel insulation sheet (100) formed in a patterned shape.